/**   
 * Copyright 2011 COMERE Harold
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package etrl.core;

import java.util.ArrayList;

/**
 * \class Lights
 * \brief Specialized group which can contain light sources
 * @author harold
 *
 */
public class Lights extends Group
{
	/**
	 * List of all lightSources in this node
	 */
	private ArrayList <String> _lightSources;

	/**
	 * \brief Initializes an empty Lights node
	 */
	public Lights()
	{
		_lightSources = new ArrayList <String>();
	}
	
	/**
	 * \brief Gets all light sources in this node
	 * @return light sources list
	 */
	public ArrayList <String> getLightSources()
	{
		return _lightSources;
	}
	
	/**
	 * \brief Gets the number of lightsources in this node
	 * @return light sources count
	 */
	public int getLightSourceCount()
	{
		return _lightSources.size();
	}
	
	/**
	 * \brief Adds a given light to this node
	 * @param[in] lightName light name to add
	 */
	public void addLight(String lightName)
	{
		boolean contains = _lightSources.contains(lightName);
		if(!contains) _lightSources.add(lightName);
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void accept(NodeVisitor nodeVisitor)
	{
		nodeVisitor.visit(this);
	}
}
